late 14c., "an overseer, guardian, steward," from Latin actor "an agent or doer," also "theatrical player," from past participle stem of agere (see act (n.)). Mid-15c. as [..]

person who performs a part in a play, broadcast, or other performance.

Someone or something, outside the system that interacts with the system. [D04799]

a theatrical performer a person who acts and gets things done; "he's a principal actor in this affair"; "when you want something done get a doer& [..]

a man or boy who acts in a play or film

refers either to a male performer, or to any male or female who plays a character role in an on-screen film; alternate gender-neutral terms: player, artist, or performer Cary Grant

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I don't possess a lot of self-confidence. I'm an actor so I simply act confident every time I hit the stage. I am consumed with the fear of failing. Reaching deep down and finding confidence has made all my dreams come true.   

(n) a theatrical performer(n) a person who acts and gets things done

a proctor or advocate in civil courts.

An object-oriented programming

A performance category in the IPA defined by speaking five lines or less

a gifted individual who has studied the craft of acting in order to portray roles in performances of dramatic literaure.

is an entity engaged in a use case. An actor can be a user (human), model component, submodel, submodel of another submodel, or another model as a whole.

See client.

<programming language> An object-oriented language for Microsoft Windows written by Charles Duff of the Whitewater Group ca. 1986. It has Pascal/C-like syntax. Uses a token-threaded interpreter. Early binding is an option. ["Actor Does More than Windows", E.R. Tello, Dr Dobb's J 13(1):114-125 (Jan 1988)]. (01 Mar 1994)

1. <computer programming> In object-oriented programming, an object which exists as a concurrent process. 2. <operating system> In Chorus, the unit of resource allocation. (01 Mar 1994)

Players in a room are also called "Actor". An actor has an ActorNumber, also referred to as actorId

A player that is primarily interested in roleplaying his character‘s personality and delving into his personal life. Drama queens are often actors.

A person employed by the theatre to perform in one or more of the plays of the season. At the Globe, actors rehearse for approximately six weeks working with directors, designers and professionals spe [..]

A person who performs in a theatrical play or film. One who acts; a doer. One who takes part in a situation. (legal) An advocate or proctor in civil courts or causes. (legal) One who institu [..]

A person, software system, or hardware device that interacts with a system to achieve a useful goal. Also called a user role.